Followup to 4c59cd84086f: add an entry in the porting guide and a "versionchanged" attribute.
diff --git a/Doc/c-api/init.rst b/Doc/c-api/init.rst
index 2641c8b..623bd7c 100644
--- a/Doc/c-api/init.rst
+++ b/Doc/c-api/init.rst
@@ -537,10 +537,11 @@
operations such as ``PyEval_ReleaseThread(tstate)``. It is not needed before
calling :c:func:`PyEval_SaveThread` or :c:func:`PyEval_RestoreThread`.
- .. index:: single: Py_Initialize()
-
This is a no-op when called for a second time.
+ .. versionchanged:: 3.2
+ This function cannot be called before :c:func:`Py_Initialize()` anymore.
+
.. index:: module: _thread
.. note::